Joseph kennedy



1. KENNEDY.

CLAMP.

APPLICATION FILED MAR. 18, 19%

1,304,065. Patented May 20, 1919.

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UNITED srArns PATENT OFFICE.

, JOSEPH KENNEDY, or RICHMOND HILL, NEw-YoRK, AssIe oR 'ro J. EDWARD OGDEN,

0F MOUNTAINVILLE, NEW YORK.

CLAMP.

To all whom it may concern:

Be it known that I, Josnrn' KENNEDY, a citizen of the United States of America, and a resident of Richmond Hill, Queens county, and State of New York, have invented certain new and useful Improvements in Clamps, of which the following is a specification, reference being had to the accompanying drawings. forming a part thereof.

My invention relates to clamps and its object is to provide a simple and inexpensive device for holding together two or more parts.

Another object is to so construct a clamp of this kind that it may be easily applied to the articles which it is to hold together, that it may provide for a limited amount of relative movement between the clamped parts when desired, and that its holding effect may be of a more or less permanent character.

A further and more specific object of the invention is to provide a neat and effective clamp for holding together the parts of an expansion bolt anchor which will not only facilitate the packing and handling of such devices, but which will add materially to their appearance when in use.

In order that my invention may be thoroughly understood I will now proceed to describe the same in the following specification and will then point out the novel'features thereof in appended claims.

Referring to the drawings:

Figure 1 is a longitudinal elevation, partly in section, of a two-piece expansion bolt anchor with the parts thereof held together by a clamp which embodies this invention. The section in this figure is taken on the broken line 11 of Fig. 3.

Fig. 2 is a plan view of the same parts.

Fig. 3 is an end elevation of the parts shown in the preceding figures looking toward the clamped end of the device.

Fig. 1 is a longitudinal section and Fig. 5

I a plan view of a three-piece structure with grooved ends, and with the pieces held together by clamps similar to that shown in the other figures of the drawings.

Like characters of reference designate corresponding parts in all the figures.

10 and 11 designate two correlated parts of an expansion shield for a bolt anchor, each of which is constructed with an exterior longitudinal rib 12 and 13 which, when the Specification of Letters Patent. P t t d May 20, 1919, Application filed March 18, 71918. SeriaI'NO. 223,033.

7 parts are assembled, lie diametrically opposite each other, and a plurality of transverse ribs 14: and 15 incircumferential alinement. The walls of this shield as shown, are of circular projections 16 and 17 which, when assembled, form a substantially continuous annular flange.

The interior surface of the tube is provided with spirally disposed alining ribs 18 and 19 of uniform height adapted to receive the threads of a bolt.

Expansion shields of this general type are in, common use. As the parts thereof are made in pairs it is'desirable that the two parts be held together, and'heretofore it has been the practice to tie them together by wires or springs or to construct them with interlocking lugs. According to this 111161):

tion, I provide a sheetmetal clamp 20 having a flat disk-like body 21 provided with a central aperture 22 of a diameter at least as large as that of the largest diameter of the tapered bore of the shell and preferably the same diameter as that of the inside of the shell at its clamped end, and having a flange 23 of sufiicient width to extend over and beyond the flange 16-17. This clamp is placed over the larger end of the shield formed of the parts 10 and 11, and its flange 23 bent inwardly to grip the flange 1617 of the shell. This may be done by spinning, but in Figs. 1 and 2 it is shown crimped inwardly at spaced intervals as shown at 24. This effectively clamps the parts 10 and 11 together and also holds them against longitudinal displacement and thus insures the proper alinement of the ribs 18 and 19.

When the device thus described is used to form a bolt anchorage, it is inserted in a clearance hole until the disk 21 is flush with the surface of the body in which the hole is drilled which thus presents to the eye a smooth unbroken surface preferably of tin or polished metal. When a bolt is inserted the inner ends of the parts 10 and 11 are forced apart to obtain the desired anchorage,

apart. The construction of the clamp is obviously such that its flange 23 will yield under suflicient pressure to permit of this forced separation of the parts 10 and 11.

It is not necessary that the parts which are held together by the clamp be made in pairs, as it is equally applicable to hold more than two pieces together. In Figs. 4 and 5 a structure with three parts 30, 31 and 32 is shown held together at one end by a clamp of which the orifice is designated by 42 and the flange by 413, and at the other end by a clamp 44 having a flange 45. As shown in these figures the parts 30, 31 and 32 are provided with annular grooves 33 and 341 near their ends and the flanges 4:3 and 45 are bent down into these grooves.

Devices of preferred forms and construction have been illustrated and described for the purpose of showing how this invention may be used. But these are merely illustrative embodiments of the invention and I intend no limitations other than those imposed by the appended claims.

What I claim is:

1. An expansion shield comprising a plurality of members longitudinally divided from one another, constructed near their ends to form, when assembled an annular flange, and with reduced portlons in their outer surfaces near said flange forming parts, and a sheet metal clamp arranged to hold the members together in transverse and longitudinal alinement, said clamp comprising a disk-like body portion adapted to lie transversely across and to cover the flanged ends of the assembled members, and an expansible portion extending over the flange with its free end crimped into the reduced 0 ends of the assembled membes, and an expansible portion extending over the flange with its free end crimped at spaced intervals into the reduced external portion of the members, the body portion of the clamp b ing constructed with an orifice to prevent the obstruction of the shield.

In witness whereof I have hereunto set my hand this 13th day of March, 1918.

JOSEPH KENNEDY.

Witness: I

I. B. MOORE.

Copies ofthis patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

